Screening-machine



(Ne Medel.) `'2 sheets-sheet 1. J. E. MGCRACKEN. SCREENING MACHINE.

Ne. 520,119, Peteeted Mey 22, 1894.

M Mfmu. Lrmoanm connu.

HAMM-rou. n. c.

v(No Model.) 2 Sheets-Sheet 2.

J. IE. MGGRACKEN. SCREENING MAGHINB.

No. 520,119. Patented May 22,1894.

mi NATIONAL ummm-me com-Am'.

vusmon. l:v c.

UNITED STATES V PATENT OFFICE.

JAMES'E. MCORACKEN, OF NEAR BELLEFONTAINE, OHIO.

SCREENING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 520,119, dated May 22,1 894.

Application filed January 23, 1892. Serial No. 419.090. (No model.)

T @ZZ whom it may concern:

Be it'known that I, JAMES E. McCRAcKnN, a citizen of the United States,and a resident of near Bellefontaine, in the county of Logan and Stateof Ohio, have invented a new and useful Improvement inScreening-Machines, of which the following is a specification.

My invention relates to certain improvements in machines for elevatingand screening sand, coal and other materials whereby the liner particlesare separated from the coarser and the diiferent grades of materialconveyed away to suitable receptacles; and my invention consists ofcertain novel features that will be fully described with reference tothe accompanying drawings which form a part of this specication andspecifically pointed out in the claim.

In the said drawings: Figure 1 is a plan view of my improved machine.Fig. 2 is an end view thereof. Fig. 3 is a longitudinal section, takenon the line III-III Fig. 4,1ooking in the direction of the arrow. Fig. 4is a transverse section taken on the line IV-IV Fig. 3 looking in thedirection of the arrow, and Fig. 5 is a detail top view of the mechanismfor driving the sand elevating device.

In the said drawings: 1, 2, 3, 4 represent standards or uprights of theframe carrying my improved device, and 5, 6, 7, 8, 9, crosspiecesconnecting together said standards.

11 and 12 represent angle irons which connect to the main frame asupplemental frame, composed of the outwardly extending pieces 13, 15and downwardly extending inclined supports 14, 16. Y

17 represents a hopper mounted in the main frame and adapted to receivethe material to be screened, which is raised from the pit by theconveyer 21.

18, 19 and 20 represent hoppers which are placed under the screen 41 toreceive the different grades of the screened material.

41 represents the sifting screen which is loosely mounted in the mainframe by means of the supports 45, 46 and 48, which supports are pivotedat one end to the frame and at the other to the screen. The screen isadapted to be reciprocated by means of the yoke 44, the ends ofwhich aresecured to the screen and the neck connected by means of a loop 21 to 1the crank 42 of the shaft 22, which is journaled in the frame. Motion`is given to this shaft by the mechanism hereinafter described. Themeshes of the upper half of this screen are small to allow the fnematerial to pass through, while the meshes of the lower half are largerto allow the coarser material to pass and thus separate the differentgrades of material. Secured to the bottom of the screen is a chute board55 which guides the ine material to its receiving hopper.

50 represents a set of parallel bars mounted on the screen for tailingover said screen into the hopper 20, the stones which drop from thehopper 17. Situated beneath the hoppers 18, 19, is a series of conveyers22, 23, and 24 for conveying away the different grades of siftedmaterial. These conveyers pass over sprocket-wheels,one set of which ismounted on the main shaft 25 which is journaled in the main frame, andthe other set on the shaft 51 which is journaled in the supplementalframe.

I will now describe the means for imparting motion to the device.Mounted on the shaft 25 is a spur wheel 30 which meshes with a spurwheel 32 mounted on a shaft 3l which has itsjournals in the main frame.The shaft 31 also carries a bevel wheel 33 meshing with a second bevelwheel on the shaft 34 which also has its journals in the main frame.Midway of the shaft 34 is mounted a bevel Wheel 36 engaging with a bevelwheel 36a on the shaft 22a carrying the crank 42. By this mechanism areciprocating motion is imparted to the screen. the standard 1 is asemicircular plate 40 provided With a central opening through which theshaft 34 passes, and mounted on the shaft 34 at that point is a bevelwheel 37. This wheel meshes with a similar wheel mounted on a shortshaft 52 which has its journal in a yoke 38 secured on the plate 40 bymeans of a clamp 39. 54 is a sprocket-whee1 j ournaled on the shaft 52and over which the conveyor 21 passes which conveys the material to besifted to the hopper 17. When the machine is not in use thesprocket-wheel 54 together with the conveyer 21 maybe swung out of theSecured to the top of roo Way, by turning the clamp 39 around the plate40.

The operation of my device is as followsz- Power is applied to the shaft25 which sets in motion the several conveyers and the screen. Theconveyer 21 shovels the material into the hopperl 17 which feeds it tothe screen. The parallel bars 50 tail the stones into the hopper 20, thener material dropping onto the screen. The finer particles drop throughthe ne mesh of the upper half of the screen, the reciproeating motionthrowing the coarser particles to the lower half of the screen Wherethey drop through into the hopper 19. The conveyers 22, 23 and 24passing under the hoppers convey the material away to any suitableplace.

Having thus described my invention, what I claim as new therein, anddesire to secure by Letters Patent, is-

In a sand-screening machine, the combination ofthe frame, the siftingframe loosely pers placed beneath said screen and conveyv ers passingbeneath said hoppers for conveying away the sifted material, a series ofrods on and extending the whole length of the screen for tailing overthe stones dropping on 35 p said rods, and a detlector board secnredtothe bottom of said hopper for leading the Asifted material to itshopper, substantially as and for the purpose set forth.

JAMES E. MCCRACKEN.

Witnesses:

SAMUEL H. WEST, THOMAS L. MOORE.

